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The word is that aftermarket pumps tend to fail after about a year's use.
I've seen a lot of debate on metal v. composite water pumps. The risk with metal impellers is that they can eat into the engine block if the water pump bearing fails in such a way as to allow the impeller to wobble.
After reading up on the water pump issue across the forums, I've come to the conclusion that the Porsche pump is the only way to go. The aftermarket / metal impeller risk is not worth the money saved.
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